Multiple cutter turner



` Feb. 6, 1945.

A. c. BRuNs 2,369,014

MULTIPLE CUTTER TURNER Fil'ed June 18, 1943 y m j' 2 Sheets-Sheet 1 Feb. 6, 1945. A. c. BRUNs MULTIPLE CUTTER TURNER 2 Sheets-Sheet 2 INVENTOR.

Filed June 18, 1943 Patented Feb. 6, 1945 UNITED STATE y wie? PATENT oFF-lcs v 4IiwUrLtrIPLia.- .CUTTER TURNER4 Anthony Charles Bruns, Cincinnati, Ohio Application yJune is, 1943, serial No. 4491,285

' (ol. A:z2-s 5f) l 1 claim.

This invention relates to. improvements in 4a multiple or plural tool holder, applicable .to metal turning machines, as 1a ustandard or turret lathe, for accurately simultaneously turning several diameters, center boring, chamtering, or otherA metal turning operations.

The tooling set-up provides yfor independent performance of tools having a transverse .feeding motion during a non-,feeding Vinterval of lthe holder.

The tool holder Aprovides for holding a plurality of cutters, work steady rests and othertool hold' ingA appliances at relative Opposite sides of the Work, with the workholding space between the tool supports clear for a free passage `of the cut-` tings and liquid coolant with no opportunity ,for

any collective accumulation requiring manual re,

moval during'a turning period.

An object ofthe invention is to provide a tool holder for application upon a machine tool, sustaining a plurality ci diversified cutters or bits Figure '7 is a side elevation of a .tool holding xture for independently holding and moving .a

' cutter.,- the cutter moving transversely tothe axis in a compact grouping and at relative opposite sides of the Work, for simultaneous or independent operation upon the work to perform a .multi-l plicity of turning or machining operations withv a single setting of the `tools andadapting the holder and the tools, asa unit, to be removed from the machine for preserving a tooling set-up.

Another object is to provide a tool holder, read'- ily applicable to a metal turning machine yor the lil eof bifurcated form `furnishing spaced parallel supports for positioning and grouping various tools at opposite sides of the work and the tools interchangeable from one support to the Vario-us other features and advantages Willbe more fully set forth and apparent from the description of the drawings accompanied herewith Aand forming a part hereof, illustrating a pre ferred embodiment of the invention, vin which:

Figure 1 is a top plan View of. thetool holder, as applicable to a turret yof a turret lathe, and illustrating two groups of tools respectively .arranged at` opposite vsides of the work; the Work being, when turned, in :finished form and partially cut from a bar stock.

Figure 2 is a section on line 2-2, `Figure 1.

Figure 3 is a front end View of a pair of .Work

steady rests and shoe.

Figure 4 is a front end view of a cutter or bit, and a pair of holding shoes therefor.

Figure 5 is a iront or side elevation of the tool holder with the tools removed.

Figure 6 is a side elevation of a tool and shoes;

with micrometer adjustment. y

of the Work adaptable yiorvfacing, tinecking 'or icutproviding a pair of spaced zparallelrlim'bs Vor toolsupports 2, `2, between which fthefwork 3 is ex-I tended. The limbs, each as arseparatetool support, :have

`an opening or passage 4Yhorizontallytherethrough and longitudinally of the Work for. receiving and sustaining a plurality yof jtoolsin'juXta arrangement. The tools extend through the .passage for operating upon 'the work, and .relatively 'set for cutting several `diierent Ydiameters or .other work 'turning operations during `the relative feeding advance of the tool holder yand Work, and .for

conjoint operationfrom relative .opposite .sides of the Work. VWith the tools simultaneously effec'- tiVe, respectively from opposite sides of the yWork,- there is a balancing `of the cutting strain :upon

the work, avoidingwork ydeiiection, so thaty the:` machining can be to very'close tolerances. It

also provides for the simultaneous performance of several machining' operations which :could i'not be accomplished by 'any .juXta-positioninglof the tools on one side of the Work, fdue to vthe 'tool width limitation. v f

The tool supports 2 42, join with a body `or headhaving a flange ,5 on its upper side :and slotted for transversing a pair tof bolts'for `clamping the, l

holder to a face side of :a turret. The head oi? the ,holder has a `tubular -shank s6, lprojecting cen.-

trally therefrom for engagement dinto Va 'bore :or orifice in the turret, for additional anchorage to the turret and provide a stock for drill,fihold-ing arbor 1 holding a ldrill8 for center drilling the work. 'Ihearbor'isfix'ed within the stock Vof theholder by a set screw 9,' accessible .fromthe top side of the holder. l

The tool receiving passages 4 of `the supports'A are'. of corresponding dimension and preferably" relativelyioifset, Vorf'at diierent elevations, .topro" g vide-.for.interhangeability fof the toolsafrom 'one upon the side of the work that the cutter bit is Y located and direction of work rotation.

The cutter bits I0, generally are formed from a conventional size of bar stock, square in cross section, as for example, from a 1/2" x 1/2" bar and engaged within a longitudinal channel in each of val, as `for cutting an annular vgroove 20 into the a pairof shoes II, I I, and between which the bit is confined and clamped. The lower shoe is machined to give the proper settingof the bit to the work and ready for service when positioned and clamped Within the holder. This provides a simple and inexpensive bit and bit mounting readily applicable within the tool holder. The cutter or bits generally are of a high speed steel or may constitute Stellite and carbide tipped cutters.

Each support 2, of the holder is provided with plural rows of tool clamping screws I2, all acces-f sible from the topof the holder and with the adjoining screws in each row'of relatively different length to disalign the heads thereof for a minimum spacing. The screws in each row may be in staggered arrangement to accommodate for an adequate clamping engagement with the tools of a. group irrespective of the spacing or angular positions necessary for the tools to occupy for a given setting.

It is possible to remove vany tool from either side of the holder for substitution or regrinding Without disturbing the setting of the other tools of a group. The opposing arrangement of tools provides for cutting a shoulder with one tool and curving the edge with a second tool which dual performance could not be accomplished with the tools on one side as the proximity would prevent proper mounting.

It is also possible to apply work rests 'at either side of the work for appropriately opposing a cut ter at an opposite side. The rests are compara-` tive toa tool, and for a type as illustrated'in Figures 2 and 3, comprise a pair of bars I3, I4, each gudingly engaged within a channel of a shoe I5, between the rest bars. The lower rest I3 abuttingly engages a side of the work, and the upper rest Ill-has a bevelled or tapering end for a bearing contact on the top side of the work. The tips of the rest bars are suitably hardened to resist wear and furnish a proper bearing support against work deflection or vibration which would be detrimental. to true and accurate machining. The rest may be either in single or compound as` sembly, and of any suitable width dimension to meet'the needs. As` illustrated in Figures 8 and 9, a pair of rests I6, Il, are assembled with their Work engaging ends shaped to present a V for a plural point bearing contact againstI the work and accommodate for taper turning. The rest opposes an elongated single cutter I8 for turning the full length of taper, and adjoins a single cutter .I9 for shoulder cutting at the inner end of the taper.

A tool set-up, as shown in Figure 1, provides, at the final feeding stage, for simultaneously per.. forming five different turning operations together with center drilling of the work. Some of the tools are progressively effective, as toward the end of a feeding period, while other tools, having work, termed necking, or cutting a finished piece of Work from a bar stock.

When the cutting is performed on both sides, there is a balancing of the work, eliminating the use ofr guides. On work that must 'be held to very close tolerances, the cutters. are placed both front and back to balance the cutting action as closely as possible, and preferably doing slightly more cutting with the front tool. With the opposed relation of the tools, it is possible to turn a shoulder as small as .001 of an inch, and when necessary for extremely accurate tool setting, the tool independently can be provided with a microkmetric adjustment, as illustrated in Figure 6. In such instance, the lower shoe 2| at its forward end has an upwardly extending lug 22, carrying an adjusting screw 23 for engagement with the ,rear butt end of the cutter bit.

The use of a multiple or group of cutters on one side or both sidesfor turning the work with various diameters, is more economical over the method of providing a single congurated cutter. A single cutter shaped to produce the finished form of the Work requires the services of a skilled mechanic to produce and to maintain it in an efcient working condition.

For necking, or work vcutting oi operation, which requires a feeding motion of the .tool transverse to the axis of the work, a cutting tool or bit 24is slidably mounted within a shank 25 of a fixture 26. The shank of the xture is engaged through and clamped within the tool receiving passage 4 of one of the supports of the holder. 'I'he rear end of the bit extends beyond the body or head of the fixture, and is provided with a plurality of spaced apertures 21 for adjustably pivotally connecting the same to a hand lever 28 extending perpendicularly to the bit. The bit extends through an elongated aperture in the lever, and is pivotally connected therewith by a pin 29, vThe lower end of the hand lever is bifurcated to straddle a bracket 30, extending laterally from the lower end of the body ofthe fixture, and the lever is slidably and pivotally connected to the bracket by a pin 3| traversing the elongated slots in the limb ends of the lever.

The lever is provided with a stop screw 32 for limiting the feeding motion of the bit. The bracket 30 is of a form to limit the retreating movement of the lever and sustain the same in an erect position. The upper end of the lever has a, removable hand-hold, adapted to be fixed in either a contiguous or angular position on the end of the lever.

As illustrated in Fig. 1, a plurality of tool iixtures, respectivelyas shown in Fig. '7, are included in the tool assembly of the holder. One for a necking operation, disposed in an intermediate` position of the group of tools of one arm 2, for cutting an annular groove 20 into the work, and a. second, as an end tool of the group in the opposite arm, for cutting the finished piece of work from the bar stock.' In each instance, the shank 25, of the fixture is engaged through the passage or opening 4, of an` arm 2 of the holder and securely clamped to the 4arm by a relative pair of set screws I2. A,

The holder is mounted upon theturret of a turret lathe, with the turret mounted upon a slide, which may be fed either manually o-r by poweigand at an appropriate rate longitudinally of the work. The cutting'tools on the holder with the advance of the slide are brought into cooper- 1 ation with the Work, the Work rotating at a proper rate with the headstock of the lathe within which it is gripped following the common practice.. The tool holder is adaptable to being mounted upon a carriage of a standard lathe, with the Work gripped and rotated by the headstock brought centrally in the Work spacebetween the two supports of the holder. v

Having described my invention, I claim:

A multiple tool holder, comprising: a body having a pair of spaced tool carrying supports integrally connected at one end, each removably sustaining tools for machining the Work from op- Posite sides, the Work rotatively supported and extending into the open spacing 'and intervening said supports, each support having a longitudinal passage therethrough for mounting. a.v plurality of tools Iin juXta-position transversely therein,k

ing with said tool for manually actuating they same and adjustable means for limiting the throw` of the handle` to-contro1 advance of the tool to the work. l

ANTHONY CHARLES BRUNS. 

